<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
   *{margin: 0;
    padding: 0;
    box-sizing: border-box;
} 
.d1{
    width: 1226px;
    height: 615px;
    background-color: yellow;
}
.d2{
    float: left;
      width: 234px;
      height: 614px;
      background-color: #800080;
}
.d3{
    float: left;
      width: 234px;
      height: 300px;
      background-color: #87ceeb;
      margin-right: 14px;
      margin-bottom: 14px;
}
.d3:nth-child(4n) {
      /* background-color: red; */
      margin-right: 0;
    }
.d3:nth-child(n+5) {
      margin-bottom: 0;
    }
.d4{
    float: right;
      width: 978px;
      height: 614px;
}
</style>

<body>
    <div class="d1">
     <div class="d2"></div> 
        <div class="d4">   
     <div class="d3"></div>     
     <div class="d3"></div>     
     <div class="d3"></div>     
     <div class="d3"></div>     
     <div class="d3"></div>     
     <div class="d3"></div>     
      <div class="d3"></div>     
     <div class="d3"></div>     

     </div> 
    </div>
</body>
</html>